Upright tank jet system

ABSTRACT

A jet system is beneficial in keeping a drilling particulates of a drilling fluid evenly mixed within an upright storage tank having a side wall, a top wall and a bottom wall. The jet system has a nozzle on each half section of a horizontally disposed upper arm and a plurality of nozzles on each half section of a lower rotatable arm disposed adjacent the bottom wall for keeping particulates of the drilling fluid suspended above the upper and lower arm. The upper arm redistributes and suspends particulates of the drilling fluid from near the bottom of the tank above the upper arm to thereby keep particulates of the drilling fluid suspended throughout the entire volume.

FIELD OF THE INVENTION

The present invention relates to an improved upright tank jet system forkeeping particulates of a drilling fluid evenly mixed and suspendedthroughout the total volume of the fluid in the tank.

BACKGROUND OF THE INVENTION

It is of utmost importance to keep particulates within drilling fluidevenly mixed, dispersed and suspended to thereby maintain an optimaldensity for the drilling fluid and eliminate the potential forflocculation of the particulates on the floor of the tank. Keepingparticulates of the drilling fluid evenly dispersed helps prevent valvesfrom becoming clogged, pumps from failing prematurely, unwanted andexpensive tank cleanings required to remove buildup, and the loss ofdrilling fluid resulting from the foregoing problems. Therefore, thereis a need to provide a jet system for an upright drilling fluid tankthat prevents particulates from settling out of the drilling fluid whilekeeping the drilling fluid and particulates evenly mixed and dispersedthroughout the entire volume of the fluid in the tank.

Upright holding tanks for storing drilling fluids can be 20 foot inheight by 12 foot in diameter and have a capacity of 400 barrels. Thedrilling fluid stored in the tank is commonly referred to as drilling“mud”. The drilling mud may consist of bentonite clay (gel) withadditives such as barium sulfate (barite or “bar”), calcium carbonate(chalk) or hematite. Both barite and hematite are high-densityadditives. Thus, drilling fluids or drilling “mud” is typically a dense,viscous and cohesive fluid. Moreover, the high-density additives such asbar have a tendency to settle out of the drilling fluid over time ifleft unagitated or disrupted. Therefore, an upper jet system incombination with a lower jet system is needed to provide maximumdisruption and agitation of the total volume of drilling fluid in thetank to keep particulates of the drilling fluid, such as bar, suspendedand evenly dispersed in the drilling fluid. There is also a need toredistribute drilling fluid from the bottom portion of the tank to theupper portion of the tank through the upper jet system to keep an evendistribution of particulates. In addition, because of the density of thedrilling fluids, there is a need to provide a jet system in the upperportion of the tank to thereby agitate, disrupt and suspend particulatesof the drilling fluid within the upper portion of the tank.

BRIEF SUMMARY OF THE INVENTION

Therefore, it is a primary object, feature, or advantage of the presentinvention to improve over the state of art.

It is a further object, feature, or advantage of the present inventionto provide a jet system capable of operating and meeting workingobjectives in a “deep” surface environment, such as in an upright tankhaving a drilling fluid depth of 20 feet.

Yet another object, feature, or advantage of the present invention is toprovide a jet system wherein the nozzles remain unclogged of the heavyweighted drilling “mud”.

A further object, feature, or advantage of the present invention is toprovide a jet system wherein the equipment costs for constructing thejet system are minimal.

Yet another object, feature, or advantage of the present invention is toprovide a jet system wherein the lower arm covers the entire diameter ofthe tank bottom.

Still a further object, feature, or advantage of the present inventionis to provide a jet system wherein the upper arm redistributes fluidtaken from the bottom of the tank into the portion of the tank above theupper arm.

Another object, feature, or advantage of the present invention is toprovide a jet system wherein the nozzles are capable of operatingbetween 60-80 psi, the common operating head pressure for drilling fluidpumps.

A still further object, feature, or advantage of the present inventionis to provide a jet system wherein the upright tank is used to store oilrig drilling fluids.

Yet another object, feature, or advantage of the present invention is toprovide a jet system wherein the total volume of drilling fluid in thetank is agitated to prevent “dead spots” from developing in the tankwhere particulates, such as “bar”, can settle out of the drilling fluid.

A further object, feature, or advantage of the present invention is toprovide a jet system wherein the lower arm is rotatable to sweep overthe bottom of the tank to thereby prevent flocculation of theparticulates, clogging of the valves and nozzles, and destruction ordamage to pumps.

Another object, feature, or advantage of the present invention is toprovide a jet system wherein the nozzles have an orifice size bestsuited for creating a jet stream of the drilling fluid.

A further object, feature, or advantage of the present invention is toprovide a jet system wherein the upper arm may also rotate toredistribute drilling fluid from the bottom of the tank above the upperarm and agitate particulates of the drilling fluid above the upper arm.

A still further object, feature, or advantage of the present inventionis to provide a jet system wherein the upright tank has a 20 foot heightand a 12 foot diameter for standing in the upright position.

Yet another object, feature, or advantage of the present invention is toprovide a jet system wherein the jets on the lower arm arecounterbalanced and offset from each other to cause the lower arm torotate.

One or more of these and/or other objects, features or advantages of thepresent invention will become apparent from the specification and claimsthat follow.

According to one aspect of the present invention, a jet system forkeeping particulates of a drilling fluid evenly mixed within an uprightstorage tank having a side wall, a top wall and a bottom wall isdisclosed. The jet system has a nozzle on each half section of ahorizontally disposed upper arm and a plurality of nozzles on each halfsection of a lower rotatable arm disposed adjacent the bottom wall forkeeping particulates of the drilling fluid suspended above the lowerarm. The upper arm redistributes and suspends the drilling fluid nearthe bottom wall of the tank above the upper arm to thereby keepparticulates of the drilling fluid suspended throughout the entirevolume of drilling fluid within the tank. In the preferred form, thelower arm is in fluid communication with the upper arm and the lower armis rotatable. The upper arm is positioned 9 feet from the bottom wall ofthe tank. Each nozzle on the upper arm is positioned on outermostportions of each half section.

A new method for keeping particulates of a drilling fluid evenly mixedand dispersed within an upright storage tank having a side wall, a topwall, and a bottom wall is disclosed. The method includes providing ajet system having a nozzle on each half section of an upper arm and aplurality of nozzles on a lower rotatable arm within the tank. Themethod also includes redistributing the drilling fluid at or near thebottom wall of the tank above the upper arm and suspending particulatesof the drilling fluid above the upper arm and the lower arm by agitatingthe entire volume of drilling fluid in the tank. In the preferred form,the method includes angling the plurality of nozzles on the lower armalternately upward and downward from vertical for rotating the lower armand sweeping the bottom wall of the tank of settled particulates of thedrilling fluid. The method also includes the step of angling each nozzleon the upper arm away from vertical for suspending and agitatingparticulates of the drilling fluid above the upper arm. The method alsoincludes providing the nozzle on the upper arm being positioned onoutermost portions of each half section.

BRIEF DESCRIPTION OF THE DRAWINGS

While the specification concludes with claims particularly pointing outand distinctly claiming the invention, it is believed that the presentinvention will be better understood from the following description takenin conjunction with the accompanying drawings in which:

FIG. 1 is a front view of an upright storage tank according to oneexemplary embodiment of the present invention.

FIG. 2 is a top view of an upright storage tank according to oneexemplary embodiment of the present invention.

FIG. 3 is a cross-sectional view of the upright storage tank in FIG. 1taken along line 3-3.

FIG. 4A is a cross-sectional view of the upright storage tank and jetsystem in the “off” condition taken along line 4A-4A in FIG. 2.

FIG. 4B is shows the upright storage tank and jet system in FIG. 4A inthe “on” condition.

FIG. 5A is a cross-sectional view taken along line 5A-5A in FIG. 4Ashowing the orientation of the nozzles on the upper arm.

FIG. 5B is a cross-sectional view taken along line 5B-5B in FIG. 4Ashowing the orientation of the nozzles on the lower arm.

FIG. 6 shows the upright tank in FIG. 4A and another embodiment of thejet system in the “on” condition.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

The present invention includes a number of aspects, all of which havebroad and far-reaching application. Although specific embodiments aredescribed herein, the present invention is not limited to these specificembodiments. The present invention contemplates numerous other optionsand design and use of the jet system.

FIG. 1 shows a commonly used upright storage tank for storing drillingfluids. The upright storage tank 12 has a pair of substantially uprightside walls 14 ending in a top wall 16 and a bottom wall 18. Tank 12 iscommonly fitted with a ladder 26, top hatch 28 and manway 36 (shown inFIG. 2) for gaining access into the tank 12. The tank 12 is also fittedwith several features for monitoring and handling the fluid within thetank 12. For example, the tank 12 is fitted with at least one suctionline 22 for drawing fluid out of the tank 12 and at least one dischargeline 24. The tank 12 also has a fill line 32 for filling the tank 12with fluids. A gauge 34 is positioned on the tank for monitoring fluidlevels within the tank 12. A jet line inlet 20 ingresses the side wall14 of the tank 12 to provide fluid for the jet system 10 shown in FIG.3. Other fixtures are provided on the tank 12 for handling, such aslifting eye 30 and skid 38 (shown in FIG. 2). The suction lines 22,discharge lines 24 and jet line inlet 20 each have valves 54 for movingthe lines from an open to a closed position. Generally, upright storagetanks 12 used to store drilling fluids have a height of 20 feet and adiameter of 12 feet and a holding capacity of 400 barrels of drillingfluid. The storage tank 12 is built to stand upright resting on thebottom wall 18. Thus, when the tank 12 is completely full of fluid, thedepth of the fluid can reach 20 feet.

FIG. 3 shows a cross-sectional view of the upright storage tank takenalong line 3-3 in FIG. 1. The jet system 10, shown in FIG. 3, has anupper arm 40 in fluid communication with a lower arm 42 and jet inlet20. The upper arm 40 has two half sections 46 attached together usingtee fitting 50. On each half section 46 is a nozzle 44. The nozzle 44 ispositioned on the outer most part of each half section 46. One halfsection 46 is connected to the tee fitting 50 on one end and has a capfitting 64 on the opposite end positioned within retainer 62 on the sidewall 14 of the tank 12. The other half section 46 is connected to teefitting 50 and egresses the side wall 14 of the tank 12 by way of egresssleeve 74 and is in fluid communication with the jet line inlet 20. Inthe preferred form, the half sections 46 or arm 40 would be constructedof 4-inch outer diameter pipe but could be altered to suit the needs ofthe jet system 10. Also, in the preferred embodiment, the upper arm 40is positioned at or near 9 feet above the bottom wall 18 of the tank 12.The height of the upper arm 40 could be moved higher or lower within thetank 12 based on the height of the tank 12. As shown, each nozzle 44 ispositioned at or near the outermost portions of each half section 46 ofthe upper arm 40. FIG. 5A shows the orientation of the nozzles 44 on theupper arm 40. Each nozzle 44 is angled upward relative to vertical line78. For example, one nozzle 44 may be oriented at −15 degrees from thevertical line 78 along orientation line 80 and the opposite nozzle 44may be oriented +15 degrees from the vertical line 78 along orientationline 80. The angle of orientation for each nozzle 44 may vary. However,in the preferred embodiment, the nozzles 44 are angled alternatelyupward at + and −15 degrees from the vertical line 78. In the preferredembodiment, a nozzle 44 is mounted on each half section 46 of the upperarm 40. If need be, additional nozzles 44 could be added to each halfsection 46 of the upper arm 40 to maximize the effectiveness of the jetsystem 10. Additionally, the orientation of each nozzle 44 could bealtered from the vertical line 78 to change the agitation dynamics ofthe jet system 10.

As shown in FIG. 4A, the upper arm 40 is in fluid communication with thelower arm 42 using center arm 58. The center arm 58 is connected to theupper arm 40 by way of the tee fitting 50. A swivel joint 60 isconnected to the center arm 58 so that the lower arm 42 may rotate. Thecenter arm 58 is connected to the lower arm 42 by the cross fitting 52.The half sections 46 of the lower arm 42 are connected to the sides ofthe cross fitting 52. A cap fitting 64 is connected to the cross fitting52 on the side opposite the center arm 58. The cap fitting 64 restswithin retainer 66 and upon wear plate 68 on the bottom wall 18 of thetank 12. In one embodiment, for example, the center arm 58 isconstructed of four inch pipe, the half sections 46 of the lower arm 42are constructed of three inch pipe, and the swivel joint 60 ispreferably a four inch chickson swivel joint. Each half section 46 onthe lower arm 42 is attached to the cross fitting 52 and capped atopposite ends using a cap fitting 64. Each half section 46 of the lowerarm 42 has a plurality of nozzles 44 mounted thereon. FIG. 5B shows theorientation of the plurality of nozzles 44 on each half section 46 ofthe lower arm 42. For example, on one half section 46 of the lower arm42, each nozzle 44 is alternately oriented along orientation line 80 at−12 degrees upward and +12 degrees downward from the vertical line 78.The plurality of nozzles on the other half section 46 of the lower arm42 are alternately oriented along orientation line 81 at +12 degreesupward and −12 degrees downward from the vertical line 78. Thus, theplurality of nozzles 44 on one half section 46 are angled to create acounter-clockwise rotation similar to the plurality of nozzles 44 on theopposite half section 46. This combined with the alternating orientationof the plurality of nozzles 44 on each half section 46 of the lower arm42 from the vertical line 78 causes the arm to rotate in the directionshown by rotation arrows 48 in FIG. 3. It is preferred that the lowerarm 42 be positioned adjacent the bottom wall 18 of the tank 12 but mayalso be positioned off of the bottom wall 18 if needed. The preferredstructure shown in FIG. 4A shows four nozzles 44 mounted on each halfsection 46 of the lower arm 42. However, it is understood that fewer ormore nozzles may be mounted to each half section 46 as needed to controlthe agitation dynamics within the tank 12. Similarly, the orientation ofeach nozzle 44 can be altered to control the rate of rotation of thelower arm 42 as well as the agitation dynamics within the tank. Forexample, in one embodiment, a thread ‘o’ lette is welded to the upperarm 40 and lower arm 42. A two inch by one inch swage jet nozzle may bethreaded to the thread ‘o’ lette on the lower arm 42 and a two inch bythree-quarter inch swage jet nozzle may be threaded to the thread ‘o’lette on the upper arm 40. It is understood that varying size nozzlesand makes may be implemented and used in the jet system 10 to achievemaximum disruption and agitation of the drilling fluid 56 within thetank 12.

FIG. 4A also shows how the suction line 22 ingresses the side wall 14 ofthe tank 12 ending in an elbow fitting 70. The elbow fitting 70 isturned down toward the bottom wall 18 of the tank 12 so that the suctionline 22 pulls drilling fluid 56 from off or near the bottom wall 18 ofthe tank 12. A valve 54 is positioned on the suction line 22 for movingthe line to an open and closed position.

FIG. 4A shows the jet system 10 positioned within the upright tank 12filled with drilling fluid 56. The drilling fluid 56 has heavierparticulates 72 which have a tendency to want to settle out of thedrilling fluid 56. Over time, the particulates 72 also have a tendencyof flocculating on the bottom floor 18 of the tank 12. Thus, as shown inFIG. 4A, if the drilling fluid 56 is left undisturbed or unagitated overa period of time, the particulates 72 settle out of the mid and upperportions of the tank 12 and near the bottom wall 18. The settling andflocculation of particulates 72 on the bottom wall 18 of the tank 12 canclog suction line 22 and ultimately damage a pump (not shown) used toextract the drilling fluid 56 from the tank 12. Prolonged buildup ofparticulates 72 on the bottom wall 18 of the tank 12 can require thetank to be cleaned professionally resulting in thousands of dollars ofexpense. Also, because the drilling fluid 56 has high-density additives,such as barite or “bar”, the resulting drilling fluid 56 is a verythick, cohesive, viscous fluid. Consequently, the jet system 10 must bespecifically tailored to redistribute the particulates 72 of thedrilling fluid 56 throughout the entire volume of drilling fluid 56within the tank 12. To evenly redistribute, agitate, and disrupt theparticulates 72 of the drilling fluid 56 within the tank 12 requiresmultiple nozzles 44 and arms 40, 42 located at varying elevations withinthe tank 12. For example, using a single lower arm 42 with nozzles 44may not evenly distribute and suspend the particulates 72 of thedrilling fluid 56 throughout the entire volume of drilling fluid 56within the tank 12. The jet stream from the nozzles 44 on lower arm 42would lose energy before entering the mid or upper level portions of thetank 12 due to the viscosity and the high-density of the drilling fluid56. Thus, particulates 72 of the drilling fluid 56 would flocculate nearthe mid and lower portions of the tank 12, as shown in FIG. 4A.

When the jet system 10 is operating, as shown in FIG. 4B, theparticulates 72 of the drilling fluid 56 are kept evenly distributed andsuspended throughout the entire volume of drilling fluid 56 within thetank 12. The even distribution in suspension of particulates 72 isaccomplished in the following manner. Drilling fluid 56 is suctionedfrom near the bottom wall 18 of the tank 12 out of suction line 22. Thedrilling fluid 56 is pressurized and pumped into jet line inlet 20. Thedrilling fluid 56 travels through the upper arm 40 and is redistributedinto the mid and upper portions of the tank 12 through nozzles 44 oneach half section 46 of the upper arm 40. The resulting jet stream 76from pressurized drilling fluid 56 exiting the nozzles 44 on the upperarm 40 causes the particles to be suspended in the portion of the tank12 above the upper arm 40. The drilling fluid 56 passes through theupper arm 40 into the center arm 58 and the lower arm 42. The drillingfluid 56 exits the lower arm 42 through the plurality of nozzles 44 oneach half section 46 of the lower arm 42. The jet stream 76 of drillingfluid 56 exiting each nozzle 44 on the lower arm sweeps the bottom wall18 of the tank 12 of particulates 72 to prevent flocculation of theparticulates 72 on or near the bottom wall 18 of the tank 12. The jetstream 76 of drilling fluid 56 from nozzles 44 on the lower arm 42 also,because of their orientation as previously set forth, causes the lowerarm 42 to rotate in the direction of the arrows 48 shown in FIG. 3. Therotation of the lower arm 42 helps sweep the bottom wall 18 of the tank12 of particulates while keeping particulates 72 of the drilling fluid56 suspended and evenly dispersed and mixed above the lower arm 42.Thus, as can be seen by the illustration in FIG. 4B, the jet system 10using the upper arm 40 and the lower arm 42 suspends particulates 72 ofthe drilling fluid 56 within the tank by agitating the entire volume ofdrilling fluid 56. Moreover, the jet system 10 keeps the particulates 72of the drilling fluid 56 evenly dispersed within the tank byredistributing the particulates 72 at or near the bottom wall 18 of thetank 12 through the upper arm 42; thus, particulates 72 are continuallyredistributed into the tank 12 above the upper arm 40. This is importantas upright storage tanks such as the tank 12 shown in FIG. 5B arecommonly 20 feet in height, thereby requiring a redistribution systemsuch as the upper arm 40 in combination with jet streams 76 forsuspending and agitating particulates 72 within the tank 12.

FIG. 6 shows another embodiment of the jet system 10. In FIG. 6, theupper arm 40 has half sections 46 attached to cross fitting 52. The halfsections 46 of the upper arm 40 have a nozzle positioned at or near theoutermost portion of each half section 46. The center line 58 attachedto the upper portion of the cross fitting is connected to a swivel joint60 so that both the upper arm 40 and the lower arm 42 rotate when thejet system 10 is operating. In operation, the upper arm 40 redistributesparticulates 72 of the drilling fluid 56 within the tank 12, above theupper arm 40, as well as suspends and agitates the particulates 72 usingjet stream 76 from nozzles 44 on each half section 46 of the upper arm40. The lower arm uses jet stream 76 to sweep the bottom wall 18 of tank12 and suspend particulates 72 of the drilling fluid 56 above the lowerarm 40.

It is preferred that the pipe and fittings be constructed of a materialcapable of withstanding the corrosion effects of the chemicals withinthe drilling fluid. For example, the pipe and fittings could befabricated from chromoly steel.

The preferred embodiment of this present invention has been set forth inthe drawings and specification and those specific terms are employed,either used in the generically descriptive sense only and are not usedfor the purposes of limitation. Changes in the form proportion of partsas well as the substitution of equivalence are contemplated ascircumstances may suggest or render expedient without departing from thespirit and scope of the invention as further defined in the followingclaims.

1. A jet system for keeping particulates of a drilling fluid evenlymixed within an upright storage tank having a sidewall, a top wall and abottom wall, the jet system comprising: a nozzle on each half section ofa horizontally disposed upper arm; a plurality of nozzles on each halfsection of a lower rotatable arm disposed adjacent the bottom wall forkeeping particulates of the drilling fluid suspended above the lowerarm; and the upper arm for redistributing and suspending the drillingfluid from near the bottom wall of the tank above the upper arm tothereby keep particulates of the drilling fluid suspended throughout theentire volume of drilling fluid within the tank.
 2. The jet system ofclaim 1 wherein the lower arm is in fluid communication with the upperarm.
 3. The jet system of claim 1 wherein the upper arm is rotatable. 4.The jet system of claim 1 wherein the upper arm is positioned 9 feetfrom the bottom wall of the tank.
 5. The jet system of claim 1 whereineach nozzle on the upper arm is positioned on outermost portions of eachhalf section.
 6. A method for keeping particulates of a drilling fluidevenly mixed and dispersed within an upright storage tank having asidewall, a top wall and a bottom wall, the method comprising: providinga jet system having a nozzle on each half section of an upper arm and aplurality of nozzles on a lower rotatable arm within the tank;redistributing the drilling fluid at or near the bottom wall of the tankabove the upper arm; and suspending particulates of the drilling fluidabove the upper arm and the lower arm by agitating the entire volume ofdrilling fluid in the tank.
 7. The method of claim 6 further comprisingthe step of angling the plurality of nozzles on the lower armalternately upward and downward from vertical for rotating the lower armand sweeping the bottom wall of the tank of settled particulates of thedrilling fluid.
 8. The method of claim 6 further comprising the step ofangling each nozzle on the upper arm away from vertical for suspendingand agitating particulates of the drilling fluid above the upper arm. 9.The method of claim 6 further comprising providing the nozzle on theupper arm being positioned on outermost portions of each half section.10. A jet system for keeping a drilling fluid evenly mixed within anupright storage tank having a sidewall, a top wall and a bottom wall,the jet system comprising: a drilling fluid inlet; an upper armhorizontally disposed within the tank and in fluid communication withthe drilling fluid inlet; a nozzle positioned on outermost portions ofeach half section of the upper arm; a lower arm horizontally disposedadjacent the bottom wall of the tank and in fluid communication with theupper arm; a plurality of nozzles on each half section of the lower arm;and the nozzle on each half section of the upper arm for redistributingthe drilling fluid from near the bottom wall of the tank above the upperarm to thereby keep the drilling fluid evenly mixed.
 11. The jet systemof claim 10 wherein the nozzle on one half section of the upper arm isoriented upward at +15 degrees from vertical and the nozzle on the otherhalf section is oriented upward −15 degrees from vertical.
 12. The jetsystem of claim 10 wherein one half section of the upper arm isoperatively attached to the sidewall of the tank.
 13. The jet system ofclaim 10 wherein one half section of the upper arm egresses the sidewallof the tank.
 14. The jet system of claim 10 wherein half sections of theupper arm are connected with a tee fitting.
 15. The jet system of claim14 wherein a center arm being vertically disposed is connected to thetee fitting.
 16. The jet system of claim 15 wherein the lower arm isrotatably mounted to the center arm using a swivel joint.
 17. The jetsystem of claim 16 wherein a cross fitting connects half sections of thelower arm to the center arm and a cap fitting.
 18. The jet system ofclaim 17 wherein the cap fitting is operatively housed within a seat onthe bottom wall of the tank.
 19. The jet system of claim 18 wherein thecap fitting rests on top of a wear plate within the seat on the bottomwall of the tank.
 20. The jet system of claim 10 wherein the pluralityof nozzles on one half section of the lower arm are oriented alternatelyupward +12 degrees and downward −12 degrees from vertical.
 21. The jetsystem of claim 20 wherein the plurality of nozzles on the other halfsection of the lower arm are oriented alternately downward +12 degreesand upward −12 degrees from vertical.
 22. The jet system of claim 10wherein the plurality of nozzles on the lower arm are oriented to causethe lower arm to rotate.
 23. The jet system of claim 10 wherein an elbowfitting egresses the sidewall near the bottom wall of the tank forsuctioning the drilling fluid near the bottom wall to be pumped backinto the tank through the drilling fluid inlet.
 24. The jet system ofclaim 10 wherein half sections of the lower arm extend outward to aposition adjacent the sidewall of the tank.
 25. The jet system of claim10 wherein the upper arm is rotatably mounted to a swivel joint forrotating the upper arm and the lower arm.
 26. A method for keepingparticulates of a drilling fluid evenly mixed and dispersed within anupright storage tank having a sidewall, a top wall and a bottom wall,the method comprising: providing a jet system having an upper armhorizontally disposed within the tank, a nozzle positioned on outermostportions of each half section of the upper arm, and a lower armhorizontally disposed adjacent the bottom wall of the tank having aplurality of nozzles on each half section; suctioning the drilling fluidfrom the tank at or near the bottom wall; pumping the drilling fluidinto the upper arm and the lower arm; redistributing the drilling fluidwithin the tank using each nozzle on the upper arm and the plurality ofnozzles on the lower arm; and suspending particulates of the drillingfluid within the tank by agitating the entire volume of drilling fluidwith each nozzle on the upper arm and the plurality of nozzles on thelower arm to thereby keep the drilling fluid and particulates evenlymixed.
 27. The method of claim 26 further comprising providing a swiveljoint between the upper arm and the lower arm.
 28. The method of claim27 further comprising the step of rotating the lower arm using theplurality of nozzles.
 29. The method of claim 26 further comprising thestep of sweeping particulates of the drilling fluid from off the bottomwall using the plurality of nozzles.
 30. The method of claim 26 furthercomprising the step of disrupting and suspending particulates of thedrilling fluid above the upper arm using the nozzle on each half sectionof the upper arm.